JP3378741B2 - Security sensor with sight - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a projector, a light receiver,
The present invention also relates to a crime prevention sensor provided with a sighting device for adjusting the optical axes of a light projector and a light receiver, and more particularly to improving workability of the optical axis adjustment.

[0002]

2. Description of the Related Art Generally, an active type infrared security sensor includes a light projector having a light projecting element, a light receiver having a light receiving element, and a sighting device, and the infrared light projected from the light projector is received by the light receiver. , The object is detected by the light shielding between them. In this case, a sighting device is used to adjust the optical axes of the light emitter and the light receiver, and the vertical angle and the horizontal angle of the light receiver are adjusted while looking at the light emitters provided on the light emitter and the light receiver, respectively. Align the optical axis visually. After this adjustment, use a tester to measure the level at which the infrared rays from the projector are received by the receiver, and finely adjust the above-mentioned angle of the receiver to reach the predetermined received level, and perform the final adjustment of the optical axis. To do.

[0003]

However, when the optical axis is adjusted while looking through the sighting device, the position of the image of the projector is displaced if the viewing angle differs depending on the individual.
There is a problem that it is not easy to correctly align the optical axes of the light receiver. In fact, even if the optical axis is properly aligned, when the level of received light is measured using a tester, the received light level may not be obtained.

[0004] Incidentally, in the case of adjusting the optical axis by looking through the sighting device of the light receiving device from the back side of the light receiving device, Japanese Patent Application No. Sho 49-41.
The sighting device disclosed in Japanese Patent No. 143 is known.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems and provide a security sensor with a sighting device which can easily adjust the optical axes of a light projector and a light receiver in a short time.

[0006]

In order to achieve the above object, a security sensor with a sight according to one configuration of the present invention is
A light projector having a light projecting element, a light receiver having a light receiving element for receiving light from the light projector, and a sighting device for adjusting the optical axis are provided. The light receiver has an adjusting means for adjusting the optical axis, a viewing window for looking from the side of the light receiver , and a mirror for showing the projector and a light emitting body that is turned on for adjusting the optical axis inside the sight. From the peep window
A sight with a mirror that can look into the projector and the light emitter ,
Lighting control means for changing the lighting state of the light emitter according to the amount of light received from the projector. Here, the optical axis of the light receiver is
The direction in which the amount of light received by the light receiver is maximized. According to the above configuration, while looking into the sighting window of the sighting device from the side surface side of the light receiver, the light receiving level can be confirmed by the lighting state of the light emitter that changes according to the amount of light received from the light projector, and the optical axis can be adjusted. Therefore, the work of adjusting the optical axis to a predetermined light receiving level becomes easy. Therefore, the final adjustment using a tester thereafter becomes easy. In addition, the structure is simple and can be manufactured at low cost.

[0007] Preferably, the luminous body is provided in a position close to the mirror so as not to obstruct the field of view of the mirror when viewed from the observation window. Therefore, the light emitter and the projector projected on the mirror do not overlap with each other, which facilitates the optical axis adjustment work.

Preferably, a pair of left and right sight windows and mirrors of the sighting device are provided, and the light emitter is provided between them. Therefore, depending on the condition of the installation location,
The optical axis can be adjusted by looking into either the left or right side of the viewing window.

Preferably, the lighting control means turns on, blinks, or turns off the light emitter according to the amount of light received from the projector. Therefore, the optical axis can be accurately adjusted while observing the lighting state of the light emitter.

Preferably, the lighting control means changes the color of the light emitter according to the amount of light received from the light projector. Therefore, the optical axis can be accurately adjusted while observing the color change of the light emitter.

Preferably, the lighting control means turns off the light emitter when the direction of the optical axis is within an allowable range. Therefore, it is possible to reduce the power consumption of the light-emitting body after the optical axis adjustment and save energy.

Preferably, the sighting window of the sighting device is provided with a field-of-view limiting frame having a length twice or more the diameter. Therefore, when looking into the viewing window, it is possible to reliably look at the mirror, not the light-emitting body that is lit.

Preferably, the light emitter has an alarm function of changing a lighting state when a light beam received by the light receiver from the light projector is blocked. Therefore, the light emitter can be used both for alarm display and for optical axis adjustment.

Preferably, the adjusting means rotates the dial around the first axis by a manual operation, and rotates the holder supporting the light receiving element around the first axis in association with the rotation of the dial. It has a gear interlocking mechanism. Therefore,
The position adjustment of the light receiving element in the rotation direction around the first axis becomes easy.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1A shows a configuration diagram of a crime prevention sensor with a sighting device according to an embodiment of the present invention. This security sensor includes a light projector B having light projecting elements b, b, and a light receiver A having light receiving elements a, a for receiving the infrared rays IR projected from the light projector B. The projector B and the receiver A are respectively housed in the main body case 18,
It is fixed to the wall K (or pole, etc.). As long as the infrared ray IR from the projector B is not shielded, this security sensor keeps the alarm indicator lamp (LED) 7 of the light receiver A turned off, and turns on the alarm indicator lamp 7 when shielded.

The light receiver A further includes a light emitter B and a light receiver A.
A sighting device C with a mirror is provided for adjusting the optical axis. This sighting device C has a viewing window 12 for looking from the side surface of the light receiving device A, a mirror 14 for reflecting the light projecting device B therein, and an optical axis rough adjustment indicator lamp (light emitting body that is turned on when the optical axis is adjusted). LED) 8 (see FIG. 4). In the optical axis adjustment, the direction of the optical axis is adjusted by adjusting means 50, which will be described later, by looking at the lighting state of the optical axis coarse adjustment indicator lamp 8 through the observation window 12. The projector B is a well-known one that emits infrared light IR and projects it.

In FIG. 1B, the electric signal output from the light receiving element a according to the amount of light received from the projector B is amplified by the amplifier circuit 2, and the signal strength of this amplified signal, that is, the variation amount of the infrared light flux. Are constantly monitored by the level detecting means 3. The level detection means 3 detects the signal level of the electric signal to be inputted, and the detected signal level is the second lighting control for lighting the first lighting control means 6 which is the lighting control means and the warning indicator lamp 7. And output to the means 9.

The first lighting control means 6 changes the lighting state of the optical axis rough adjustment indicator lamp 8 into lighting, blinking and extinguishing states according to the amount of light received from the projector B. That is, the first lighting control means 6 constantly compares the signal level detected by the level detection means 3 with the first and second levels set in the first and second level setting sections 4 and 5, and The lighting control signals S0 to S2 are output according to the level. When the signal level does not exceed the first level (when the optical axis direction is not aligned), the lighting control signal S0 is output, and the signal level is the first level.
When the value is equal to or higher than the level and does not exceed the second level (when the direction of the optical axis is within the allowable range), the lighting control signal S
1 is output and the lighting control signal S2 is output when the signal level is equal to or higher than the second level (when the optical axis direction is aligned).

Then, the first lighting control means 6 indicates the lighting control signal S to indicate that the directions of the optical axes are not aligned.
In order to turn on the optical axis rough adjustment indicator lamp 8 by the output of 0 and indicate that the direction of the optical axis is starting to be within the allowable range,
The optical axis coarse adjustment indicator lamp 8 is made to blink by the output of the lighting control signal S1, and the optical axis coarse adjustment indicator lamp 8 is turned off by the output of the lighting control signal S2 to indicate that the direction of the optical axis is aligned. When the signal level detected by the level detecting means 3 exceeds the third level set in the third level setting section 11, the second lighting control means 9 outputs an alarm signal k0 to output an alarm indicator lamp. 7 is turned on and an alarm output is sent to the outside. The level detection means 3, the first and second level setting sections 4, 5 and the first and second lighting control means 6, 9 are CPs.
It is built into U20.

The optical axis rough adjustment indicator lamp 8 may be constituted by, for example, one having two LEDs which respectively emit red and green when turned on. In this case, the first lighting control means 6 outputs one of the LEs by outputting the lighting control signal S0.
Only D is lit to emit red light, and a lighting control signal S1
One LED is turned off and the other LED is turned on to emit green light, and both LEDs are turned off by the output of the lighting control signal S2.

Further, the display section 19 of FIG. 6 is provided with a pin hole P. By inserting a monitor jack J having a tester T connected to the pin hole P, the electric signal from the level detecting means 3 is transmitted. The signal level is confirmed, and final adjustment is performed by adjusting the adjusting means 50 (FIG. 3) described later so that the signal level becomes equal to or higher than a predetermined value.

FIG. 2 is a partially cutaway front view of the light receiver A, FIG. 3 is a cut right side view, and FIG. 4 is a sectional view taken along line IV-IV of FIG. In FIG. 3, the main body case 18 of the light receiver A is composed of a resin-made cover 22 and a chassis 23, and an engagement step portion 27 at an upper portion of the cover 22 engages a locking projection 24 of the chassis 23. At the same time, the fixing screw 28 is screwed into the lower part of the cover 22 to cover the cover 22 and the chassis 23.
And are combined. Further, a mounting plate 26 for mounting on a wall, a pole or the like is arranged on the back surface of the main body case 18, and the mounting plate 2 is mounted on the engagement step portion 25 at the upper part of the chassis 23.
6 engages with the locking projection 29 and the chassis 23
The chassis 23 and the mounting plate 26 are joined by screwing a fixing screw 30 into the lower part of the.

The light receiving element a shown in FIG. 3 is mounted on a printed circuit board 31, housed inside a substantially cylindrical holding member 33, and further housed in a lens case 32 divided into two. A lens 34 is fitted and fixed on the front surface of the lens case 32 and is exposed from the main body case 18.

As shown in FIG. 4, the lens case 32 is
The central portion in the up-down direction is rotatably supported by a fixed shaft 35a that is a second shaft fixed to the lens case holder 35. Further, in FIG. 3, the lower portion of the lens case 32 is supported by the holder 35 by screwing an adjusting screw 57, which will be described later, into a protrusion 32a provided on the lower portion. One end (lower end) of the holder 35 is first
It is rotatably supported by the chassis 23 by a support shaft 36 which is a shaft of the. A shaft portion 37 is provided at the other end (upper end) of the holder 35 so as to project, and the shaft portion 37 is rotatably fitted in the support hole 23a of the chassis 23.
A cord (not shown) from the printed board 31 is inserted through the cord insertion hole 38 formed in the. Furthermore, FIG.
The display unit 19 and the terminal unit 42, which are connected to the printed circuit board 41, are provided on the upper portion of the photodetector A.

The sight C with a mirror includes a lens case 32.
And is exposed when the cover 22 is removed from the chassis 23. As shown in FIG. 4, this sighting device C is provided with a pair of left and right sight windows 12 and mirrors 14 and a pair of left and right sighting holes 15, and is turned on between the pair of mirrors 14 when the optical axis is adjusted. The optical axis rough adjustment indicator lamp 8 is arranged. Also, peep window 12
Includes a field-of-view limiting frame 16 having a length that is at least twice the aperture.
Are provided (see FIG. 5). The optical axis rough adjustment indicator lamp 8 is provided in a position close to the mirror 14 so as not to obstruct the field of view of the mirror 14 when viewed through the observation window 12.

The adjusting means 50 shown in FIG. 3 has a first adjusting section 51 and a second adjusting section 52. The first adjusting unit 51
The support shaft 5 parallel to the support shaft (first shaft) 36 by manual operation
Dial 54 that rotates around 3, and this dial 54
And a gear interlocking mechanism 55 for rotating the holder 35 supporting the lens case 32 containing the light receiving element a around the support shaft 36 in association with the rotation of the gear. The gear interlocking mechanism 55 is composed of a drive gear 55 a formed of an external gear formed in the central portion of the dial 54 and a driven gear 55 b formed of an internal gear formed on the facing surface of the holder 35.
The lens case 32 has its horizontal angle (in the h direction in FIG. 2) about the vertical axis V moved by the rotation of the dial 54.

The second adjusting portion 52 is attached to the mounting flange 59 of the holder 35 and is rotated by turning the knob 57a by a manual operation.
7 and the protrusion 32a and the mounting flange 5
9 and a coil spring 60 interposed between the adjusting spring 57 and the adjusting screw 57.
And a stopper 61 formed of a nut that is screwed to. In the lens case 32, the protrusion 32a moves in the axial direction with respect to the adjusting screw 57 by the rotation of the adjusting screw 57, and rotates around the fixed axis (second axis) 35a in FIG. 4, that is, around the horizontal axis H. The vertical angle of movement (v direction in FIG. 2)
Is adjusted.

The optical axis adjusting operation of the security sensor with a sight according to the present invention will be described below. First, the cover 22 is removed, and the optical axes of the light projector B and the light receiver A shown in FIG. Using the sight C of the projector B, the optical axis is roughly adjusted as in the case of the photoreceiver A described below. As shown in FIG. 5, the coarse adjustment of the optical axis of the photodetector A is performed while looking into either the left or right viewing window 12 of the photodetector A from the side surface side of the photodetector A. Dial 54 or second
By operating the adjusting screw 57 of the adjusting section 52, the rough adjustment is performed so that the projector B reflected on the mirror 14 is located at the center of the sighting hole 15 in FIG. Since the viewing window 12 is provided with a field-of-view limiting frame 16 having a length that is at least twice the aperture, when the viewing window 12 is viewed, the optical axis coarse adjustment indicator lamp 8 that is turned on is not illuminated. The mirror 14 can be reliably seen.
This is because the nerve is likely to concentrate on the lighted optical axis coarse adjustment indicator light 8 and the mirror 14 may be difficult to see depending on the angle, and this is excluded.

FIG. 7 shows the relationship between the light receiving state of the light receiver A and the lighting state of the optical axis rough adjustment indicator lamp 8. Emitter B and receiver A
When the directions of the optical axes are not aligned, the lighting control signal S0 is output from the lighting control means 6 in FIG. 1 and the optical axis coarse adjustment indicator lamp 8 is turned on (α in FIG. 7). When the vertical and horizontal angles of the light receiving element a are adjusted by operating the dial 54 and the adjusting screw 57, the direction of the optical axis begins to fall within the allowable range, and the lighting control means 6 outputs the lighting control signal S1 to The rough axis adjustment indicator light 8 blinks (β in FIG. 7). Further, when the vertical angle and the horizontal angle of the light receiving element a are adjusted, the projector B is overlapped with the center of the aiming hole 15 (see FIG. 5), the direction of the optical axis is aligned, and the signal from the level detecting means 3 has the maximum value, that is, the maximum value. When the value exceeds about 60% of the value when the optical axes are perfectly aligned, the lighting control signal S2 is output from the lighting control means 6 and the optical axis rough adjustment indicator lamp 8 is turned off (γ in FIG. 7). As a result, the coarse adjustment of the optical axis is performed.

Next, after the above optical axis adjustment, by inserting the monitor jack J connected to the tester T into the pin holes P provided at both ends of the display section 19 in FIG. 6, the electric signal received by the photodetector A is inserted. The signal level of, that is, the level of the output signal from the level detecting means 3 is confirmed. While observing the level display of the tester T, the vertical angle and the horizontal angle of the light receiving element a are finely adjusted so that the signal level becomes the predetermined value or more in the best optical axis state. At this time, since the optical axis rough adjustment indicator lamp 8 is also provided in the display section 19 above the light receiver A, the lighting state is displayed even outside the sight C according to the optical axis adjustment. It is not necessary to look at the optical axis rough adjustment indicator lamp 8 in the inside.

Thus, the optical axis is finally adjusted and the crime prevention sensor is installed. The installed security sensor outputs an alarm signal k0 from the second lighting control means 9 when the infrared IR from the projector B of FIG.
Is turned on and an alarm output is sent to the outside, and when the infrared IR is not shielded, the state where the alarm indicator lamp 7 is turned off is maintained.

As described above, according to the present invention, while looking into the sighting window of the sighting device from the side surface of the light receiving device, the light receiving level is confirmed by the lighting state of the light emitting body which changes according to the amount of light received from the light projecting device to adjust the optical axis. Therefore, the optical axis can be adjusted easily and in a short time. Further, when the direction of the optical axis is within the allowable range, that is, the optical axis coarse adjustment indicator lamp 8 is turned off in the state after the optical axis adjustment, the power consumption after the optical axis adjustment can be reduced and energy saving can be achieved. .

In this embodiment, the first lighting control means 6 changes the lighting state of the optical axis coarse adjustment indicator lamp 8 to each of the lighting, blinking, and extinguishing states, but it is turned on without blinking. , May be turned off. In this case, the device can be simplified, but there is a drawback in that the adjustment is slightly rough.

Next, a second embodiment will be described.
FIG. 8 is a block diagram of the security sensor with a sighting device according to the second embodiment, and FIG. 9 shows a display unit 19 thereof. This security sensor is shown in FIG. 8 as the first lighting control means 6 of FIG.
The optical axis coarse adjustment indicator lamp 8 is not provided, and the optical axis coarse adjustment indicator lamp 8 is not provided in the display section 19 of FIG. This security sensor is provided with an alarm indicator light 7 on the display section 19 and an optical axis rough adjustment indicator light 8 in the sight C.
Alarm indicator lamp (light emitter) for displaying coarse optical axis adjustment instead of 7
A is provided, and the optical axis is adjusted by the second lighting control means 9 and the alarm indicator lamp 7A in the sight C. Other configurations are similar to those of the first embodiment, and detailed description thereof will be omitted.

When adjusting the optical axis, the second lighting control means 9 of FIG. 8 determines that the signal level from the level detection means 3 is a value not exceeding the third level set in the third level setting section 11. That is, when the directions of the optical axes are not aligned, the lighting control signal S3 is output to turn on the alarm indicator lamp 7A for displaying the rough adjustment of the optical axis in the sight C. Then, when the signal level is a value equal to or higher than the third level, that is, when the direction of the optical axis is within the allowable range, the second lighting control means 9
Stops the output of the lighting control signal S3 and turns off the warning indicator lamp 7. The lighting control signal S3 is the same as the warning signal k0. Therefore, the lighting state can be confirmed by the warning indicator lamp 7 of the display section 19 of FIG. In this way, the optical axis is roughly adjusted, and then the optical axis is finely adjusted as in the first embodiment, and the security sensor is installed. After the security sensor is installed, the second lighting control means 9 in FIG. 8 turns on the warning indicator lamp 7 (FIG. 9) by the output of the warning signal k0 and sends the warning output to the outside.

[0036]

According to the embodiments of the present invention, the viewing window of sight light receiver
The optical axis can be adjusted by checking the light receiving level from the lighting state of the light emitting body that changes according to the amount of light received from the projector while looking into the side surface, and therefore the optical axis adjustment work becomes easier.

[Brief description of drawings]

FIG. 1 (a) is a schematic side view showing a security sensor with a sighting device according to an embodiment of the present invention, and FIG. 1 (b) is a configuration diagram showing its light receiver.

FIG. 2 is a partially cutaway front view showing a light receiver of the security sensor.

FIG. 3 is a sectional right side view showing a light receiver of the security sensor.

4 is a cross-sectional view taken along the line IV-IV of FIG.

FIG. 5 is a perspective view showing a sighting device.

FIG. 6 is a front view showing a display unit.

FIG. 7 is a diagram showing a relationship between a light entering state and a lighting state.

FIG. 8 is a configuration diagram showing a light receiver of a security sensor with a sighting device according to a second embodiment.

FIG. 9 is a front view showing a display unit of the security sensor with the sighting device.

[Explanation of symbols]

6 ... Lighting control means, 8 ... Light emitter, 12 ... Peep window, 14
... mirror, 16 ... field limiting frame, 50 ... adjusting means, 54
... Dial, 55 ... Gear interlocking mechanism, a ... Light receiving element, b ...
Emitter element, A ... Receiver, B ... Emitter, C ... Sight with mirror.

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-2-55929 (JP, A) JP-A-50-138882 (JP, A) Actual development 4-53580 (JP, U) (58) Field (Int.Cl. ⁷ , DB name) G01V 8/10 G01J 1/02 G01V 8/20 G08B 13/19

Claims (9)

(57) [Claims] 1. A security sensor with a sighting device comprising a light projector having a light projecting element, a light receiving device having a light receiving element for receiving light from the light projecting device, and a sighting device for adjusting an optical axis, photodetector includes an adjustment means for adjusting the optical axis, the viewing window for excluding from the side of the light receiver, aiming
Vessels therein, a light emitter that lights when the mirror and the optical axis adjustment Projecting projector, contact these projectors from viewing window
And a sighting device with a mirror capable of looking through the light emitting body, and a lighting control unit having a sighting device for changing the lighting state of the light emitting body according to the amount of light received from the projector. 2. The security sensor with a sighting device according to claim 1, wherein the light emitter is provided in a position close to the mirror so as not to obstruct the field of view of the mirror when viewed through the observation window. 3. The security sensor with a sighting device according to claim 2, wherein a pair of left and right viewing windows of the sighting device and a mirror are provided, and the light emitter is provided therebetween. 4. The security sensor with a sighting device according to claim 1, wherein the lighting control unit turns on, blinks, or turns off the light emitter according to an amount of light received from the light projector. 5. The security sensor with a sighting device according to claim 1, wherein the lighting control unit changes a color of the light emitter according to an amount of light received from a light projector. 6. The security sensor with a sighting device according to claim 1, wherein the lighting control unit turns off the light emitter when the direction of the optical axis is within an allowable range. . 7. The security sensor with a sighting device according to claim 1, wherein the sighting window of the sighting device is provided with a field limiting frame having a length that is at least twice the diameter of the sighting device. 8. The sighting device according to claim 1, wherein the light emitter has an alarm function of changing a lighting state when a light beam received by the light receiver from the light emitter is blocked. Security sensor with. 9. The dial according to claim 1, wherein the adjusting means is a dial that rotates around a first axis by a manual operation, and a holder that supports the light receiving element in association with the rotation of the dial. Crime prevention sensor with a sighting device having a gear interlocking mechanism for rotating the shaft around a first axis.